This reports the frame encapsulation (either standard IEEE 802.1d or PBT-specific CFM encapsulation) applied to CFM frames for the service and port hosting this MEP, which determines exactly how the CCM/CFM payload is wrapped for transport across this particular kind of service. An admin needs matching encapsulation on both ends of a maintenance association, since a MEP using PBT-specific CFM encapsulation would not correctly exchange frames with a peer expecting standard 802.1d encapsulation, even if every other CFM parameter matches. For example, a PBB-TE tunnel service correctly configured with cienaCesCfmMEPEncapsulation = pbtCfmEncap would fail to establish continuity with a misconfigured peer still expecting ieee802dot1d encapsulation.